Wolf Man

Wolf Man is Ame and Yuki's father and the husband of Hana, who became a widow after his death. He has the ability to transform into a wolf; this ability was genetically passed to his children.

He was sent to live with relatives after being orphaned as a child. He was apparently the last of his kind. They didn't get along, prompting him to live on his own as a teenager.

He worked as a furniture mover and delivery man. In his free time, he sat in on lectures and took notes at the college Hana attended, though he was not registered as a student.

The cause of his death is unknown. But it might be that he fell down in a canal whilst preying for a bird. He appears to Hana one final time near the movie's end, encouraging her to trust their children to find their own paths in life.

Personality
Little is known about Wolf Man. He seemed to be a calm but nice man who was shown to have a strong paternal instinct, probably due to his wolf instinct. Like any other wolf or wild animal, he preyed for food, for the survival of his mate and offspring.

Human form
In his human form, Wolf Man appeared to be a tall man with a slim build. He had short black hair with a bang and blue eyes. He also had a small stubble on his chin and above his upper lip.

Wolf form
In his wolf form, Wolf Man appeared to be an adult wolf with dark blue, grey and white fur. The fur on his head resembled his hairstyle as a human. He had blue eyes. He also has the ability to transform certain parts of his body into wolf parts (e.g. hands to paws), instead of completely transforming into a wolf.

Clothing
As a human, Wolf Man usually wore a white shirt with a stretched out collar, dark blue sweatpants, and sandals. Outside, he wore a black winter coat with a white fur collar, with his white shirt underneath.

As a wolf, he didn't wear any clothing, except when he turned into a wolf for the first time in front of Hana, where he kept his winter coat and shirt on whilst transforming.

Trivia

 * Whilst his real name is unknown, he is uncanonically referred to as "Wolf Man" or simply "Ōkami" ("Wolf" in Japanese).
 * Though while not officially canon, in some official art he is referred to as "Kare" (彼 or He).